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You've read the 4C's of diamond grading, you know the GIA diamond grading scale and every jeweler you know tells you D is the best and most expensive color of diamond to own. Thus, when your name is drawn for a contest where you can use your diamond knowledge to win a $50k prize, you are ready to show off your diamond expertise. The contest: You are presented with two diamonds, and asked to correctly identify which the of two is the most valuable in order to win a $50,000 cash prize being offered by your local radio station.

Here's the specs on the two diamonds:

Diamond A:  .33ct Oval diamond, VVS1 clarity, proportions are GIA rated as " Very Good", symmetry is "good".  Color is intense blue.

Diamond B: .41 ct Oval diamond, VVS1 clarity, proportions are GIA rated as "Very Good", symmetry is "good", color is white/colorless, and GIA rated as "D".

Applying your 4C's, you deduce the following:

1. CUT:  Both diamonds are oval cuts, with proportion = Very Good and symmetry = Good, so no edge to either diamond.  Cut fails to help you tell which is more valuable.

2. CARAT:  Diamond B is .41ct vs. Diamond A's .33ct.  Everyone knows that the bigger a diamond is, the more expensive it is so, Carat tells you that Diamond B has the edge.

3. CLARITY:  Both diamonds rate as VVS1 in clarity, so Clarity fails to show an advantage to either diamond.

4.COLOR: Diamond A is blue looking, something you've never seen, but Diamond B is white as white can be, and the GIA cert shows it as a true 'D' color.  Color clearly tells you that Diamond B again has the edge.

Thus, using the 4C's, you deduce via both carat and color that  Diamond B is clearly more valuable than Diamond A.  You pat yourself on the back for learning those 4C's.  Now to go collect the $50,000 in prize money.....

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